Bump xunit.runner.visualstudio from 3.1.1 to 3.1.5 (#211)

---
updated-dependencies:
- dependency-name: xunit.runner.visualstudio
  dependency-version: 3.1.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/SourceBrowser/src/Directory.Packages.props

@@ -36,7 +36,7 @@
     <PackageVersion Include="nunit" Version="3.12.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="3.15.1" />
     <PackageVersion Include="xunit" Version="2.9.3" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.1" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageVersion Include="Shouldly" Version="4.3.0" />